DOCTERS VAN Leeuwen : GaLLs of Krakatau and Sebesy. 293 



Fig. 2. A midge-gall on Bridelia 

 tomentosa Bl. X 1. 



No. 5. Bridelia tomentosa Bl. 



A bud-gall caused by a gall-midge. 



The end-buds of the twigs are swollen into irregular semi-ballshaped 

 or conical galls measuring 10 — 20 mM. across. The surface is glabrous 

 but covered with the cicatrices of the leaf-rudiments. Often th,e leaves 

 are developed but remain smaller than the 

 normal ones. See the subjoined figure. 

 Inside the gall there is one larval chamber 

 with a thick parenchymatous wall. The 

 surface is often covered with a corky tissue. 

 Common in Java. 



Sebesy-island, April 22nd 1921, No. 

 5111. 



Literature: D. v. L. VII. No. 365 figure 65. 



* No. 6. Calanthe Zollingeri RCHB. F. 

 Flower-gall caused by a gall-midge. 

 The flower remains closed and is altered 



into a ball-shaped gall. 



The leaflets are thick and soft and 

 the generative organs, with the exception of the ovary, are hardly develop- 

 ed. The gall-chamber so formed is tenanted by a white gall-gnat larva. 

 The ovary too is swollen though it takes no part in the gall-formation. 

 The same was the case in flowergalls of two other orchids, Eria obliterata 

 RCHB. F. collected by me, ') and Liparis Latifolia LiNDL. described by 

 Treub -). 



Sebesy-island, hill-top forest, about 700 M. April 25th 1921. No. 5269. 



Literature: ') D. v. L. Java Vil. No 399, figure 181. 



') M. Treub. Abnormaal gezwollen ovarien van Liparis latifolia 

 LiNDL. Nederl. Kruidk. Archief. 1881. Série 2. Vol. III. p. 404. 



* No. 7. Calophyllum Inophyllum L. 

 A leaf-gall caused by a lepidopteron. 



Thèse galls form long somewhat curved excrescences on the underside 

 of the leafblade. They are about 30 mM. long and in the centre 4 mM. 

 broad, they are pointed at both ends and from the middle to the ends 

 they become regularly narrower. At the uppersurface there is only a very 

 flat swelling, hardly to be seen. inside there exists an irregular larval 

 chamber; the Caterpillar eating the tissues of the gall only a thin epidermis 

 remains. 



Verlaten-island, in the Casuarina-forest. April 22nd 1920. No. 4031. 



* No. 8. Cassytha filiformis L. 



A gall on the flower-stalks caused by an unkiiown animal. 



This gall was abundant on the beach of Verlaten Eiland, but no 



